The 2-acylcycloalkanones 1a-g and 3a-c, possessing a polyfluoroalkyl group. react with hydroxylamine regio- and stereoselectively to yield 4,5-dihydroisoxazol-5-ols 2a-g and 4a-c, respectively i.e., products of N-addition to the oxo group at the cycloalkane ring (Schemes 1 and 2). The products 2 and 4 can be dehydrated under drastic conditions only (Schemes 3 and 4). The structure of one of the 4,5-dihydroisoxazol-5-ols was confirmed by X-ray crystal-structure analysis.
Novel polyfluoroalkylated pyrazoles from 2-polyfluoroacylcycloalkanones and hydrazines: syntheses and unequivocal molecular structure assignment
作者:D V Sevenard、O G Khomutov、M I Kodess、K I Pashkevich、I Loop、E Lork、G -V Röschenthaler
DOI:10.1139/v01-003
日期:2001.2.1
The reaction between 2-trifluoroacetylcycloalkanones and methylhydrazine or phenylhydrazine exclusively yields 3-CF3-pyrazoles. When the chain length of the polyfluorinated substituent in RFC(O) gr...
作者:K. I. Pashkevich、D. V. Sevenard、O. G. Khomutov、I. I. Vorontsov
DOI:10.1023/a:1011317013265
日期:——
An efficient procedure for the synthesis of 3-cyano-4-difluoromethyl- and 3-cyano-4-trifluoromethyl-2(1H)-pyridones was developed. The structure of one of the resulting compounds was established by X-ray diffraction analysis.